admin login problem when update to 2.6.2 (13 posts)

I tried to upgrade my wordpress from 2.5 to 2.6.2, I followed every steps. But the problem is I can't login. I read on many posts before, that suggest delete my .htaccess files, but still didn't solve the problem. I even try to re-install my wordpress, and re-import my sql database, and it didn't work too.

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, webmaster@raccoonnest.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Apache/2.2.9 (Unix) mod_ssl/2.2.9 OpenSSL/0.9.8i DAV/2 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 Server at raccoonnest.com Port 80

Read the tutorial again, put back the missing files and let see from there. Note: you do need the WP short index.php (and htaccess if in use) in BOTH the root and the install folder; the one in the root has to be modified according to the tutorial!

No, files related error messages are never database related.
Are you sure you have the right index and htaccess in the install (istiyanto) directory?
Don't just copy over from the root - they must be edited.

I had a similar problem with the blog - being in a subfolder of root - working fine but I could not login with the wp-admin and instead getting the ominous Internal Server Error message. After studying the errorlog of my site's admin interface (example: Fri Nov 28 12:12:43 2008] [error] [client 12.34.56.78] SoftException in Application.cpp:252: File "/home/abcdefg/public_html/pension/wp-login.php" is writeable by group) I saw that some files in the WP folder had chmod 666 set

After chmod those files to 644 with the ftp client the problem vanished.